在当今的世界上,美军在全球约()的国家中拥有基地
A.三分之一
B.四分之一
C.五分之一
D.十分之一
参考答案:B
—Lingling went to bed late yesterday, ______?
—Yes. She studied hard for the test.[ ]
A. wasn't he
B. didn't he
C. wasn't she
D. didn't she
治疗呆小症最能奏效的时间是在出生后()
A.3个月左右
B.6个月左右
C.10个月左右
D.12个月左右
E.1~3岁时